/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package controller.user;

import dao.UsersDAO;
import entity.Users;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Turtle
 */
public class login extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet login</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet login at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
             */
        } finally {            
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String action = request.getParameter("action");
        String url = "";

        if (action == null) {
            url = "userpages/login.jsp";
        } else if (action.equals("load")) {
            url = "userpages/login.jsp";
        }
        
        RequestDispatcher rd = request.getRequestDispatcher(url);
        rd.forward(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession session = request.getSession();
        String action = request.getParameter("action");
        String url = "";

        if (action == null) {
            url = "userpages/LogIn.jsp";
        } else if (action.equals("load")) {
            url = "userpages/LogIn.jsp";
            if (session.getAttribute("user") != null && session.getAttribute("user").equals("normal")) {
                url = "Home?action=load";
                response.sendRedirect(url);
                return;
            }
            if (session.getAttribute("user") != null && session.getAttribute("user").equals("admin")) {
                url = "Admin_Home?action=load";
                response.sendRedirect(url);
                return;
            }
        } else if (action.equals("login")) {
            if (request.getParameter("login_name") != null) {
                Users user = UsersDAO.logIn(request.getParameter("login_name"), request.getParameter("login_password"));

                if (user.getUsername() == null) {
                    String error_info = "Fail to log in";
                    request.setAttribute("error_info", error_info);
                    url = "userpages/login.jsp";
                } else if (!user.getUsername().equals("admin")) {
                    url = "home?action=load";
                    session.setAttribute("user", "normal");
                    session.setAttribute("user_name", user.getUsername());
                    response.sendRedirect(url);
                    return;
                } else {
                    url = "admin_home?action=load";
                    session.setAttribute("user", "admin");
                    session.setAttribute("user_name", user.getUsername());
                    response.sendRedirect(url);
                    return;
                }
            }
        }

        RequestDispatcher rd = request.getRequestDispatcher(url);
        rd.forward(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
